Automatic machine for making metal screws, &amp;c.



N'o. 688,498. Patented Dec. I0, 190|.l

' G.v F. BAILEY.

AUTMA'TI MACHINE FR MAKING META SCHEWS, 81.6.

(Application filed Oct. 26, 1900.)

'(No Mode-l.)

WIT ESSI-:L

9 Sheets-Sheet 2.

lun/ENTUR.

AUTMATIC MACHINE FOB MAKING METAL SCBEWS, &c.

(No Model.)

Wa rplssses WWW- n No. 688,498.. Patented nec. lo, 190|.

\ G. F. BAILEY. A UOMTIG MACHINEFR MAKING METAL SCB'EWS, 81.0.'

(Appxication mela occ. 2e, 1900,)

SSheets-Sheet 3.

Y THE Noum's sirens ou.. vHoTo-urno., wAsHmnToN, D4 n..

No. 688,498.y yPatentud Dec. I0, I90I.

i G. F. BAILEY. AUTOMATIC MACHlNE FOR MAKING METAL SCREWS, &.c.

' (Application med oef. 26, i900.) (No Model.) 9 Sheets-Sheet 4.

9 Sheets-Sheet 5.

Patented Dee. lo, 190|. f

m. -..l N%

l No'. 688,498. v G. F. BAILEY.

AUTOMATIC MACHINE FOB MAKING METAL ASCFEWS, &'c. .(Nu Model.)

No. 688,498y Patented'Dec. |0, |901.

l G. F. BAILEY.- v AUTOMATIC MACHINE FOR MAKING METAL-SGREWS, &c.(Application filed Oct. 26, 1900.) l (nu Model.) sshqets-sheet s.

or m mill-MINI IIIIIIIIIII HIII A l @@01:96'57' ae Patentedjnec. lo,Ism.

y l8. F. BAILEY. AUTOMATIC' MACHINE FR MAKING METAL SGBEWS, 88C.

(Application led Oct. 26, 1900.)

9 Sheets-*Sheet 7.

(No Model.)

No. 683,498. Patented meollo, |901.

-' a. F. BAILEY.

AUTOMATIC MACHINE FOR MAKING METALSGREWS, .&c.

(Application filed Oct. 26, 1900.)

me Nonms wens co... muvo-urna.. WASHINGTON.' n. c.

G. F. BAILEY.

AUTOMATIC MACHINE FR-MAKING METAL SCREWS, &c.

(Application mea o'ce. 26, 1900. (no Model.) 9 sheefs-sheet 9.

Ffa l? No. 683,498. Patented nec. lo., |9m.

V'UNITED STATES PATENT OFFICE.v

GEORGE E. BA1LEY,.OE WALTHAM, 'MASSACTIUSETTS ASSIGNOR To THE WALTHAMSCREW COMPANY, `OE WALTHAM, MASSACHUSETTS, `A COR- PORATION OEMASSACHUSETTS..

AUTOMATICMACHINE FOR-MAKING METAL scREws", sco.

SPECIFICATION forming part of LettersPatent No. 688,498, dated December10, 1901- Apparition med october 26,1900. `serai no. 34,496. (No man.)

To all whom it'may concern: Y

y Be it known that I, GEORGE F. BAILEY, a citizen of the United States,residing at Waltham, inthe count-y of Middlesex and State ofMassachusetts, have invented certain Improvements in Automatic Machinesfor Making Metal Screws andother Analogous Articles, of which thefollowing is a specification.

My invention relates to automatic machines for making metal screws andother analogous articles, and has for its object to greatly simplify theconstruction of machines of this Y description and at the same timerender them tain novel features, combinations of parts,

more effective and capable of increased production.

To this end my invention consists in cerand details of construction, ashereinafter more fully described, and Specifically pointed i out in theclaims.

In the accompanying drawings, Figure 1 is a plan view of a screw-machineconstructed in accordance with my invention, the threading-die plungerand die lbeing vabout torecede and the slotting-saw being half-waythrough ythe head of a screw previously made. Fig. 2 isa rear elevationof the machine. Fig. 3 is an endview showing the tailstock and partsadjacent thereto. Fig. 4 is anl elevation of the end ofthe machineoppositerto that shown in Fig. 3. Fig. 5 is a longitudinalverticalsectionron the line 5 5 of Fig. 1.

Fig. 6 is a transverse vertical sectionl on the line 6 6 of Fig. 1. Fig.7 is a transversevertical section on the line 7 7 of Fig. 1. Fig. 8 isatransversevert-ical section on the line 88 of Fig. 1, showing the stopin a position to intercept the end of tlie'stock rodor wire. Fig. 8?* isa transverse vertical section 'similar to that shown in Fig. 8, showingthe parts inthe same. position'as in Fig. 1. Fig. 9 is a transverse.vertical section on the line 9 9 of .p Fig. 1, the rocker-frame andparts connected therewith being shown in dotted lines." Fig. Qafisatransverse vertical section similar to that shownin Fig. 9, bntshowingthe parts in a'dilferent position. Fig. 10-is a sectional detail of theStop for the stock-rod on the line 10 10 of Fig.1. Fig. 11 is asectional detail on the line 11 11of Fig. 1. 12 isan` enlarged sectionaldetail on the line l12 12 of Fig-1. Fig. 13 is a sectional detail on theline 13 13 of Fig. 1. Fig-14 is an enlarged vertical section on the line14 14 of Fig. 2, showing the means for adjusting the sawframel forvariations` in diameter'of screwheads. Fig. 15 is a plan view of theportion ofthe machine shown in Fig. 9a, butwith the parts in a differentposition. Fig. 16 is a sectional detail of the transferfarm chuck,showing a screw therein which has been nearly severed from the end ofthe stOck-rodby the cutting-tool. Fig. 17 isan enlarged vertical sectionof the upper end of the transfer-f arm and its screw-receiving chuck.Fig 18 is a horizont-al section of the same, showing 'a screw held inthe chuck ready for the slotting-saw. Fig. 19 is an enlarged detail inplan, showing the stop adjusted on its Stud into a position to interceptthe stock by contact vwith the shoulder formed by the screwhead. Fig. 2Ois a similar view showing the stop adjusted to intercept the point orend of the stock-rod.

f In the Said drawings, 10 represents the bed of the machine, which isprovided with three longitudinal parallel grooves 12, in which tittongues 14 on the bottoms of the head and tail lstocks and the severalbrackets for snpporting the operating parts of the machine, the saidhead andv tail stocks and brackets,

which areheldin place' by suitable bolts or screws, being therebymaintained in their upper surface of .the'bed 10 is preferably made,slightlyl concave to retain the oil drippings from the spouts whichsupply oil to the operating parts ol the machine.

l'denotes the driving-shaft, on which is fixed -the grooved cone-shapeddriving-pulley 16, (shown in Fig. 2,) said shaft lbeingjournaled in abracket 22 and provided with a worm 17, which meshes with a wornrwheel18 on the horizontal camshaft-19,fwhich is supportedin suit-ablebearings in the brackets 20 21 and carriesall of the cams used inoperating the machine. v

The wire or stock-rod 23, from which the screws are made, is cut intosuitable lengths IOO and passes through a tubular guide on the bench(not shown) into and through a tubular spindle 24, which I term thefeed-tube or push-chuck spindle, said spindle having screwed into itsfront end a removable friction-chuck 25, split lengthwise to formspringjaws, which grasp the wire with sufficient friction to feed itforward against a stop, to be hereinafter described, when the spindle 24is moved in the direction of its length by mechanism to be hereinafterdescribed.

The spindle 24 is encircled by and is free to turn within a secondtubular spindle 26, the rear end of which rests in a bearing 28 at therear end of the head-stock 30. This spindle 2G, which I term thedrawing-in spindle, has no longitudinal movement and carries at itsfront end a conical wire-gripping chuck 32, split lengthwise for aportion of its length to form spring-jaws, which are normally open andthrough which the wire is pushed against a stop, to be hereinafterdescribed, by the forward movement of the push-chuck spindle. Outsidethe spindle 26 and forming a bearing therefor is a third tubular spindle34, which extends over a portion only of the length of the spindle 26,as shown in Fig. 5, and is supported at its front end in a bearing 35 atthe front end of the head-stock. The interior of the mouth or front endof the spindle 34 is made tapering or beveled to fit the conical end ofthe chuck 32, and said spindle is provided at its rear end with abarrel-hub 36, in which is placed a washer 33, from which projectsrearwardly a series of pins 37, which support a series of spiralsprings38, which enter recesses in and bear against a flanged collar 39 on thesecond spindle 26, thereby forcing the outer spindle 34 forward andcausing its flaring mouth to act on the outer beveled surface of theconeshaped gripping-chuck 32 to close its springjaws tightly upon thewire or stock-rod previously pushed through the same againstits stop bythe forward movement of the push-chuck spindle. The friction thusproduced will enable t-he outer spindle to rotate the second spindlewith the wire, the latter imparting its rotary n iotion to the innerspindle by reason of the friction of the push-chuck 25 upon the wire.

The pins 37 prevent the springs 38 from buckling under pressure, and thewasher 33, being free to turn independently of the barrel-hub 36,insuresthe retention of the springs in place in case the outer sleeve shouldturn a little in advance or behind the chuck-holding spindle, as mightoccur when the chuck is being changed. The outer spindle 34 carries thefast pulley 40, over which passes alternately a straight belt 4l and across-belt 42, running over pulleys on a counter-shaft, (not shown,)whereby the spindle 34 is rotated alternately in opposite directions,and with it the chuck 32 and stock-rod gripped thereby.

On opposite sides of the fast pulley 40 are two loose pulleys 43 44, onefor the straight the head-stock, thus saving expense and liability offracture in hardening the spindle owing to its variable thickness.Furthermore, when these bushings become worn they can be easily removedand replaced at a trifling expense and the cost of an entire new spindlethus avoided.

The longitudinal movement of the spindle 24 to produce the feed of thestock is effected by a lever 47, fulcrumed at 48 and fitting looselybetween two collars 49 50, adjustable on the threaded rear portion ofsaid spindle 24, said lever being actuated against the resistance of aspring 5l by a cam 52 on the face of the worm-wheel, the forwardmovement of the lever 47 to effect the feed of this stock-wire beingproduced by the spring -51 and its retraction by the cam 52. Byadjusting the collars 49 50 to vary their distance apart the lever 47will have more or less lost motion before coming into contact witheither collar, thereby varyingthe amount of feed of the wire for screwsof different lengths.

The feed of the wire takes place as soon as the jaws of thegripping-chuck 32 are permitted to spring open to release it, which iseffected by a slight longitudinal retraction of the outer spindle 34 onthe second spindle 26 against the resistance of the springs 38,`

which movement is produced by a lever 54, secured to the end of arock-shaft 29, supported in brackets 3l, said rock-shaft being providedbetween the brackets with ayoke 46, embracing the spindle 34 and havingroundended pins 53, which bear against the hub 36, said lever beingactuated against the resistance of springs 38 bya cam 56 on the camshaft19. (Shown in Figs. 2, 5, and 6.) As soon as the lever 54 is released bythe cam 56 the outer spindle is again forced forward by the springs 38to cause the jaws of the gripping-chuck 32 to clamp the stock-wire,immediately after which the inner spindle 24is drawn back by the lever47, causing the spring-jaws of the push-chuck to slip back frictionallyover the wire to take afresh hold for the next feed.

The cam 56 consists of a disk provided with a removable piece 58 ofhardened steel, which is brought into contact with a friction-roll 57 onone end of the lever 54 when the latter is to be actuated. By adjustingthe position of this cam-piece 58 on the disk the time when thegripping-chuck is permitted to open to release the wire may be varied,as a variation in the amount of stock for screws of different lengthsrequires a longer or a shorter time for the threading-die to do itswork, and

IOO

IIO

consequently the cam is adjusted so that the' pense in constructionanddoing away with the necessity of a number of different cams.

Iwill now describe the manner in which the straight and crossed beltsare alternately shipped onto and off the fast pulley to rotate thetubular spindle and stock-wire in opposite directions.

59 is a rock shaft passing transversely through the head-stock 30, whichforms a bearing therefor. To one end of this shaft 59 is secured anangle-lever 60, from the upwardly-inclined arm 6l of which projects astud 65, the lower arm of this lever carrying at its extremity acam-roll62, held in contact with acam 63 on the cam-shaft 19 by a spring 64,secured to the lever and to the bed-plate. (Shown in Figs. 1, 2, and 7.)To the opposite end of the lever 59 is secured an upwardly-extending arm66, which is inclined in the direction opposite to that of the arm 61 onthe other side of the head-stock, and like it is provided at its upperend with a stud 67.

68 69 are two belt-shipping arms or levers arranged on opposite sides ofthe head-stock and pivoted on the shaft 59, so as to turn freelythereon. These arms are drawn in opposite directions against suitablestops 73 and 74 and held, respectively, in contact with the studs 61 67by two spiral springs 70 7l, and each arm carries at its upper end apivoted or swiveling frame 72, forming a guide through which passes oneof the belts 4l 42.

The shape of the cam 63 is such that both belts being` upon their loosepulleys the straight belt will rst be shipped onto the fast pulley andthen back again onto its loose pulley,when the crossed belt will beinstantly moved onto the fast pulley to reverse the rotation of thespindle and then returned to its loose pulley on the left, the straightbelt re'- maining on its loose pulley at the right, when the spindlewill remain at rest.

If the machine should be stopped when both belts are on their loosepulleys and the clamping-chuck is gripping the wire, and it should bedesired to open the chuck to change or replenish the stock, the outerspindle 34 maybe drawn back by means of a hand-lever 75, fulcrumed tothe head-stock and acting against a crank-arm 76, depending from the Tothe front end of the head-stock on a conical stud 78, located beneathand in the same vertical plane with the center of. the wireholdin gchuck 32, is pivoted a frame or rocker 80, which carries on one side ofsaid Wireholding chuck a disk 81, which in one position ofthe rockerforms a stop against which the stock-wire is pushed when fed forward bythe push-chuck spindle 24. On the opposite side of the pivot 78 therocker carries the cutting-tool 82, which when the rocker is oscillatedin the opposite direction is brought into contact with the end of thestock for the purpose of turning the same to form the screw.

On the upper flat side of the rocker 80 is a dovetail groove, in whichis iitted a sliding block 83, adjustable in the direction of the lengthof the rocker and transversely of the machine by means of a screw 84,and from this block 83 projects a threaded stud 85, on which turns theinteriorly-threaded disk stop 81, which is thus made adjustable in thedirection of the length of the machine toward and from the wire-grippingchuck for different lengths of screws. This longitudinal adjustment alsoenable the stop-disk 8l to be so placed as to catch the stock-wireeither by intercepting its point or the shoulder under the screw-head,the latter when the screw has a sharp point and it is desired to preventinjury to the point by contact with the stop. In connection with thelongitudinal adjustment of the stop 8l on its threaded stud 85 to catchthe point or the shoulder of the screw it will be necessary to adjustthe stop transversely of the machine by means of the sliding block 83and 'screw 84, so that it will project beyond the line of axis of thestock to intercept its end or only sufciently far to catch the shoulderunder the head. The stop 8l is clamped in position on its threadedsupporting-stud 85 by means of set-screws 86, which pass axiallythroughthe hub of the stop 81 and bear on soft-metal plugs 87 in contactwith the thread of the stud, which is thereby preserved from injury.

On the rear'side-of the pivot or stud 78 the rocker 80 is provided onits flat upper side with anadjustable block 90, (shown in Figs. 1, 2,and 11,) sliding in a groove extending transversely across the rockerand parallel with the spindles, said block being clamped when adjustedby means of a screw 91, and from this block projects a stud on which isfastened by means of a nut the circular shaping tool or cutter 82,having a cutting edge 93 of proper shape to turn the stock-wire to formthe screw, said cutter being broughtI into operative contact with therotating wire when the long arm of the rocker 80 is raised, whichmovement at the same time carries the stopdisk 8l out of the path of theWire. By'adjusting the slide in` the direction of the length of themachine the position of the cutting-tool may be varied to formscrew-heads of different lengths.

In a dovetail groove on the front side of IOO IIO

the long arm of the rocker 80 and extending in the direction of itslength is fitted a slide 94 adjustable longitudinally in said groove bymeans ofa screw 95, said slide being provided with ahorizontally-projecting pin 77, which rests on the upper side of a lever96, pivoted at 97 to a bracket 98 and having on its under side a. flatspring 88, secured thereto at one end by a screw and provided with adownwardly-projecting toe 99, bearing on a cam 100 on the cam-shaft 19,said cam acting through the lever 96 on the pin 77 to operate the rocker80 against the resistance of a spring 101, which keeps the toe incontact with the cam, said spring having one end connected with therocker and the other end with the bed of the machine.

89 is an adjusting-screw passing through the lever 96 and bearing on thefree end of the spring 88, whereby the toe 99 may be forced downwardfrom the lever 96 to cornpensate for wear by contact with the cam 100,said screw 89 being clamped when adjusted by a set-screw 102. Thebracket 98 has two cheeks, one on each side of the lever 96, which serveas guides therefor and prevent lateral motion as the lever rises andfalls. By adjusting the slide 94 the distance of the pin 77 from thefulcrum 97 of the lever 96 may be varied to change the degree ofoscillation of the rocker and the consequent forward throw of the cutterfor stock of dierent diameters or where more or less turning of thestock is required to vary the diameter of the body of the screw. The cam100 has three rises or portions at different distances from its center.The first or longest one is a gradually-increasing rise, used when thecutter is turning the stock as it causes the cutting-tool 82 togradually approachthe line of axis of the stock. The second or middleportion of the cam is concentric and holds the rocker 80 in a centralposition while the threading-die, to be hereinafter described, isrunning on and off the end ot' the wire. The third or lowest portion ofthe cam allows the rocker to move backward to withdraw the cutting-tooland at the same time bring the disk stop 81 in front of thewire-gripping chuck to intercept the stock-wire when next fed forwardand determine the length of the screw, as previously described.

It will be obvious from the foregoing that all of the requiredvariations in the amount of movement which it may be desired to give tothe rocker 80 may bel produced by the simple adjustment of the slide 94,thus obviating the necessity of a change of cams for operating saidrocker. As the cutter becomes worn from grinding it can be adj ustedaround its axis by means of a screw 105, projecting from a small angularpiece 106, Figs. S and 11, said screw forming a stop for thecuttingtool, the cutting edge 93 of which can thus be brought to itsproper level with relation to the center of the stock.

the end of a horizontally-sliding spindle or plunger 111, mounted insuitable bearings in the tail-stock 112 and encircled outside itsbearings by a spiral spring 113, bearing at one end against thetail-stock and at the other end against an adjustable collar 107 on theplunger. The die-plunger is forced forward against the resistance of thespring 113 to cause the die to engage the end of the screw by a lever114, fulcrumed at 115 and moved against the resistance of a spring 116(shown in Fig. 1) by a cam 117 on the cam-shaft 19 to cause it to strikethe outer end of the dieplunger at the required time, as shown in Figs.1, 2, and 3. The lever 114 is not at all times in contact with thedie-plunger, being moved up to the same by the cam 117. This enables theamount of longitudinal movement of the die-plu nger to be varied forscrews of different lengths. The lever 114 is provided with anadjusting-screw 118,which rests on the cam 117, and by means of thisscrew the advance of the die-plunger may be regulated with great nicety.The die-plunger and die are prevented from revolving while the thread isbeing cut by a pin 120, projecting at right angles from said plungerover and resting upon the edge of a horizontal block 121, adjustablelongitudinally by means of a screw 122 on a bar 123, fastened to thetailstock and held in place by a binding-screw 124. (Shown in Figs. 1and 13.) As soon as the pin 120 reaches the end of the block 121 itdrops 0E the same, when the die-plunger and die will revolve with thestock, thus stopping the further cutting of the thread, immediatelyafter which the straight belt 41 is shipped onto the loose pulley 43 atthe right and the crossed belt 42 is brought onto the fast pulley 40,reversing the motion of the spindle 34 and causing the threading-die tobe backed 0E the screw, the die and die-plunger being then held fromrevolving by a pawl125, which is pivoted to the tail-stock, andinstantly engages a longitudinal groove 126 in the die-plunger, which isthus locked to cause the threading-die to be backed off the screw, andas soon as it is disengaged therefrom the spring 113 carries thedie-plunger back to its normal position, the lever 114 having beenpreviously withdrawn.

The threading-die is secured to the end of the die-plunger 111 by meansof a couplingnut 79, which on the withdrawal of the dieplunger isbrought into contact with the front end of the tail-stock 112, whichthus forms a stop to limit the backward movement of said plunger. Thecrossed belt 42 is now immediately shipped onto the loose pulley 44 onthe left, when the rotation of the chuck-spindle will be arrested. Thespindle, with the stock, now being` at rest the gripping-chuck 32 isopened by the action of the cam 5,6, as previously described,thusreleasing the stock, which is then fed forward by the push-chuck 25against the disk stop 81, which has been previously advanced tointercept it. The

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straight belt 41 is then shipped onto the fast pulley and the rocker 80oscillated to bring the cutting-toolV 82 into action to cut off thescrew previously formed and at the same time turn the stock to form thenext screw. The length of the thread cut on the screw is determined byadjusting the sliding block 121 to vary the time when the pin 120 willdrop off its end on the forward movement of the plunger and die.

The mechanism by which the threaded screw after being severed from thestock rod or wire is transferred to the position where it is acted uponby a saw to form the slot in the head will now be described. On the rearside of the tail-stock 112 is a rectangular groove, in which is secureda bracket 130,-provided on its outer edge with two journal-boxes, inwhich is supported a horizontal rock-shaft 132, to the inner end ofwhich is secured a swinging arm or lever 133, termed the transfer-arm.7This arm is provided at its outer end with a hub 134, within which isplaced a chuck 135, split lengthwise to form springjaws, which areinteriorly threaded to receive the screw when the transfer-arm is swung.over to bring said chuck into alinement therewith. The chuck 135, thejaws of which normally spring open, has a cone-shaped outer end ittingwithin the correspondingly-beveled end of the hub 134 and drawn inwardlyto keep the jaws closed by a flat spring 27, secured to the transfer-armand acting against a nut 136, screwed onto the end of the chuck 135,which projects outside the hub 134. Within the rear hollow portion ofthe chuck 135 is placed a small plunger 140, provided with a shoulder,against which bears one end of a spiral spring 141, the opposite end ofwhich bears against the nut 136, the pressure of the spring tending tokeep the front end of the plunger within the front or threaded portionof the chuck, as shown in Fig. 17, the screw when entering said chuckforcing back the plunger against the resistance of the spring 141, asshown in Fig. 1S,which spring, when the chuck is opened by mechanism tobe presently described, throws the plunger forward and ejects or snapsout the finished screw into a trough or spout, down which itpassesintoasuitable receptacle. (Notshown.) The chuck 135 is forcedoutward within the hub to open it and permit its chuck to automaticallyopen and release the screw at the proper time by means of a lever 145,fulcrumed at 146 and bearing on the rear end of the chuck, said leverbeing actuated against the resistance of a spring 142 by a cam 148 onthe shaft 19. (Shown in Figs. 9 and 9a.)

The transfer-arm rock-shaft 132 is encircled by a spring 150,v one endof which is secured to acollar 151 on the shaft and the other end to thebracket 130, said spring acting to rotate the shaft to swing thetransferarm 133 over to bring its chuck intoposition to take the screwwhen permitted to do so by a cam 152 on the cam-shaft 19, in contactwith which the lower end of the transfer-arm is held by said spring 150.The collar 151 is made adjustable lengthwise of the, shaft 132 toregulate the horizontal pressure of the spring 150 and also axially toregulate the torsional stress of said spring, whichnot only exerts apressure on the shaft 132 in the direction of its length, but also byits tendency to uncoil imparts the desired axial movement to the shaftto swing down the transfer-arm 133, as before described. The downwardmovement of the transfer-arm is limited by a crank-arm 154, secured tothe end of the shaft 1,32 and provided-with an adjusting-screw 155,which contacts with a .stop 156, projecting from the bracket 130,whereby the transferarm chuck is brought intoeXact axial alinement withthe screw formed at the end of the stock. The upward movement of thetransfer-arm is lregulated and limited to bring the screw held in itschuck into exact alinement with the slotting-saw by means of anadjusting-screw 92, Fig. 18, passing horizontally through the upper endof a standard 161, rising from the bed-plate. The spring 150 tends tokeep the inner end of the transfer-arm shaft 132 in contact with theface of a camdisk 153 on the cam-shaft 19, said disk having a notch ordepression 157, into which the end of the shaft 132 is forced by theaction of the spring 150 at the moment that the transfer-arm chuck comesinto line axially with the screw, the endwise movement of the shaft thuspermitted by the notch 157 causing the threaded chuck 135 to advance`and engage the end of the screw. The sides of the depression 157 arerounded, whereby as the disk is rotated the end of the shaft will beforced out of the depression against the resistance of the spring 150 torestore the transfer-arm to its original vertical plane before it beginsto swing upward. The swinging down of the transfer-arm takes place whileAthe cutter is turning the'stock, and when the screw is nearly cut offthe threaded chuck 135 engages the revolving screw, which as soon ICOIIO

as it is screwed into the chuck up to its head cut o. Enough material isleft by the cutter to enable the screw to be turned into thetransfer-chuck up to its head, the teat-rermainingon the screw-head byreason of breaking it off being removed by the saw which cuts the slotin the head of the screw. As soon as the chuck has taken the screw thetransfer-arm 133 is swung upward by its cani against the influence ofthe spring 150 into a position to bring the screw into line with theslotting-saw to be presently described, and when in this position thehub 134, which is provided on opposite sides with two grooves 160, isembraced by the forked upper end of the standard 161, rising from thebed-plate, the forks of said standard entering said grooves and holdingthe hub and chuck firmly while the slotting-saw is operating on the headof the screw. To still further insure the firm holding of the hub andchuck and prevent any possibility ofthe transferarln chattering whilethe screw-head is being slotted, the transfer-arm shaft 132 is forcedslightly to the right by a slight rise on the face of the cam-disk153-say O05 of an inch-with which the end of said shaft is in contact,which causes the sides of the grooves in the hub to be forced tightlyYagainst the embracing-forks of the standard 161, the binding of thesurfaces in contact thus preventing any possibility of the movement orchattering of the parts while the slot is being cut.

The mechanism for cutting the slot in the head of the screw will now bedescribed. To the rear side of the head-stock, near its righthand end,is secured a bracket 165, in a dovetail groove in which is fitted aslide 166, adjustable lengthwise of the machine by means of a screw 168,said slide having two upwardlyprojecting ears or lugs 170 171. 172 isthe saw-frame, which is pivoted to the lugs 170 171 by means of acapstan-headed screw 173, said frame carrying at its outer end theslotting-saw 175, removably secured to a shaft or arbor 176, to which isalso secured a small pulley 177, driven bya belt 178 from a pulley on acou liter-shaft. (Not shown.) The sawframeis held with the end of oneside between the two lugs 170 171 and the end of the other side outsidethe lug 171, as shown in Figs.'1, 4, and 14, the screw 173 passingthrough said lugs and ends of the frame and engaging a thread in thebore of thelug 170. At the inner end of the threaded portion of thescrew 173 is a collar 174, which acts on one side of the Saw-frame tomove it in one direction,

while the head of the screw 173 acts on the other side of the frame tomove it in the opposite direction. The saw-frame may be thus adjustedtransverselyof the machine to bring saws of different widths which itmay be found necessary to employ exactly in line with the center of thehead of the screw to be slotted. The adjusting-screw 173 is clampedafter being turned to adjust the saw-frame by means of a set-screw 169bearing on a soft-metal plug 179 in contact with the screw-thread, whichis thus prevented from being injured by the set-screw. As soon as thescrew has been brought into line with the saw by the movement of thetransfer-arm, as previously described, the saw-frame is rocked on itspivots to carry the saw down to cut the slot in the head of the screw bya cam 180 on the camshaft 19, which acts on the lower end of an arm 181,depending from the saw-frame, the saw and saw-frame being returned totheirnormal positions by the tension of the drivingbelt 178 whenpermitted to do so by the revolution of the cam 180.

By adjusting the slide 166 in the direction of the length of the machineby means of the screw 168 the saw-frame and saw may be moved forward orretracted to bring the saw into the exact position required for heads ofdifferent lengths or to form slots of different depths.

As soon as the slot has been cut in the screw-head the chuck 135 isopened by the means described, when the screw will be ejected by thespring-actuated plunger 140 and the pressure of the cam-'disk 153 on theend of the transfer-arm shaft at the same time relieved, thus releasingthe hub 134, when the parts are ready to operate as before.

I will now describe the stop-motion by -means of which the machine isstopped automatically as soon as the stock-wire becomes exhausted orshortened to such an extent that the feed-chuck 25 can no longer takehold of it. When this occurs, the feed-tube 24 is free to be carriedforward by the spring 51, Figs. 4 and 5, acting through the lever 47,farther than is the case when it is clutching the stock, which brings aregulating-screw. 185 on said lever 47 into contact with the upper endof a lever 186, fulerumed at 188, which lever is then moved against theresistance of a fiat spring 189, thus tripping a weighted lever 190, theouter end of the long arm of which rests on a hook at the lower end ofsaid lever 186. The lever 190 is fulerumed to a U-shaped bracket orhanger 192, depending from the under side of the bench 193, on whichrests the bed of the machine. Through this hanger passes, at rightangles to the lever 190, a weighted lever 194, fulcrumed at 195, Fig. 4,to a hanger 196 on the under side of the bench, said lever 194 restingon a shoulder 197, Fig. 2, formed on the inside of the hanger and havingattached to one end a. wire rod 198, Fig. 4, which is connected with abelt-shipper (not shown) controlling the main driving-pulley. When theweighted lever 190 is tripped, as above described, a projection 191 onits short angular arm forces the weighted lever 194 off the shoulder197, when it will drop, and thus through the connections describedoperate the belt-shipper and stop the machine.

Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. In a serew-maehine,the combination with the outer tubularspindlehavinga fast pulley and a loose pulley on each side of said fastpulley, of a belt-shipping device consisting of a transverse rock-shaft,two arms secured to said shaft and arranged at an angle to each other onopposite sides of the head-stock, each arm being provided with a studprojecting at right angles therefrom, two belt-shipping arms pivotedloosely upon the rock-shaft and provided on opposite sides of thehead-stock at their upper ends with guides forastraight and a crossedbelt, springs for holding the shipping-arms in contact with the studs ofthe arms secured to the rock-shaft, stops for said belt-shipping arms,and a cam for actuating said rock-shaft, substantially as described.

2. In a screw-machine, the combination with a stock-holding chuck, of arocker oscillatin g IOC IIO

ess-ies` in a vertical plane at right angles to the axis of the chuckand provided on one side of the front end of said chuck with a stopagainst which the stock-rod is fed to determine the length of the screwand on the opposite side with a cutting-tool for turning the stock, andmeans for oscillating the rocker to alternately bring the stop andcutting-toolinto their operative positions, substantially as described.

3. In a screw-machine,the combination with the head-stock andstock-holding chuck, of an oscillating rocker provided with a stop and acutting-tool arranged on opposite sides of the front end of theholding-chuck, a slide adjustable on said rocker transversely of thestock-holding chuck and having a horizontallyextending pin orprojection, a leve'r forming a rest for said pin and upon which said pinmay be moved with the slide toward and away from' the ulcrum ofthe leverto vary the movement of the rocker, and means for moving the lever androcker, substantially as described.

4. In a screw-machine, the combinationwith a stock-holding chuck, of arocker oscillating in a plane at right angles to the axis of the chuckand carrying a stop and a cutting-tool arranged on opposite sides of thefront end of the chuck, a lever parallel with the rocker, a slidelongitudinally movable on said rocker and provided with a pin resting onthe lever, said slide being made adjustable, whereby the distance of thepin from the fulcrum of the lever may be varied, a cam for moving thelever and rocker in one direction and a spring for moving them in theopposite direction, substantially as described.

5. In ascrew-machine,the combination with the stock-holding chuck, ofthe oscillating rocker with its adjustable stop and cuttingtool, a slideadjustable on said rocker in the direction of its length and providedwith a pin or projection, a lever forming a rest for said pin and uponwhich it may be moved with the slide toward and away from the fulcrum ofthe lever, said lever being provided on its under side with anadjustable toe, a cam contacting with said toe for actuating said lever,and a spring connected with the rocker and acting to keep the pin incontact with the lever and the toe in contact with the cam,substantially as described.

6. In a screw-maehine,the combination with the stock-holding chuck, oflthe oscillating rocker havinga stud projectingat right angles therefromon one side of the front end of said chuck, and a stop for the stock-rodadjustable on said stud in the direction of its length and adapted bythe movement of the rocker to be brought into position to intercept thestock as it is fed forward, substantially as described.

7. In a screw-machine,the combination with the stock-holding chuck, ofthe rocker provided with a slide adjustable transversely thereof, athreaded stud projecting from said slide, a rotatable stop adjustable onsaid stud lengthwise of the machine, and means for clamping the stopwhen adjusted, substantially as described.

S. In a screw-machine, the combination of the transfer-arm and itsthreaded screw-receiving chuck provided with spring-jaws having beveledouter surfaces, said chuck being movable longitudinally within thehollow end of the transfer-arm, the latter provided with a beveled mouthcoperating with said beveled jaws, a spring for drawing the chuck withinthe end of the transfer-arm to normally close the jaws,a spring-actuatedplunger movable longitudinally within the chuck and adapted tobe forcedback by the screw as it enters said chuck, a lever acting on the chuckto open its jaws, and means for actuating said lever, said plungeracting to eject the screw when released by the chuck-jaws, substantiallyas described.

9. In a screw-machine,the combination with the swin gin g transfer-armand its rock-shaft, said arm being provided at its upper end withgrooves and carrying a screw-receiving chuck, of a standard forked atits upper end and adapted to receive and embrace said grooved end of thetransfer-arm, and means for giving a slight endwise movement to therockshaft, whereby the transfer-arm is forced laterally against theforks of the standard to lock\ it in place while the screw-head-is beingslotted by the saw, substantially as described.

IO. In a screw-machine,a slotting-sawmount ed in a frame swinging in avertical plane and adjustable toward and from the screwhead to beslotted and also in a direction at right angles to the axis of the screwto bring the saw into exact alinement with the center of the screw-head,substantially as described.

11. In a screw-machine, the combination with means for holding the screwwhile the head is being slotted, of a slide adjustable vtoward and fromthe screw-holder, a sawframe pivoted to said slide and provided with aslotting-saw, said frame swinging up and down in the arc of a circle andbeing adjustable in a direction at'right angles to the axis of the screwto be slotted to bring the saw into alinem'ent with the center of thescrewhead, substantially as described.

12. In a screw-machine, the combination with thelongitudinally-reciprocating stockfeeding spindle with itsfriction-chuck, and the lever and spring for reciprocating said spindle,of an automatic stop-motion consista ing of a weighted-lever mechanismconnected with a belt-shipper and adapted to be tripped by a forwardmovement of the feed-spindle beyond its normal working limit,substantially as described.

13. In a screw-machine, the combination with thelongitudinally-reciprocating stockfeeding spindle with itsfriction-chuck, and

means for reciprocating said spindle, of an automatic stop-motionconsisting of a catch- IOO IIO

lever adapted to be actuated byau excessive forward movement of thestock-feeding spindle, a Weighted lever having its free end supported bythe catcl1lever,a second weighted lever arranged at right angles tothefirstthe fall of the first-mentioned Weighted lever to stop the machinewhen the Stockrod has become exhausted so that it can no longer be fedforward, substantially as described.

lfVitness my hand this 24th day of October, x5

mentioned Weighted lever and adapted to en- A. D. 1900. gage a shoulderon Vthe hanger to which the first-mentioned weighted lever is pivotedsaid second Weightedl lever being connected with io belt-shippingmechanism and being tripped by GEORGE F. BAILEY. In presence of- R. M.STARK, JOHN A. TOLMAN.

